#region The MIT License
// The MIT License
// 
// Copyright (c) 2009 octalforty studios
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#endregion
using System;
using System.Collections.Generic;
using System.Xml;

namespace octalforty.Componento.Shared.Util
{
    internal static class XmlParserUtil
    {
        public static T[] Parse<T>(XmlNode node, string xpathExpression, XmlNamespaceManager namespaceManager, Func<XmlNode, T> parser)
        {
            XmlNodeList objectNodes = node.SelectNodes(xpathExpression, namespaceManager);

            if(objectNodes == null || objectNodes.Count == 0)
                return new T[] { };

            List<T> objects = new List<T>();
            foreach(XmlNode objectNode in objectNodes)
                objects.Add(parser.Invoke(objectNode));

            return objects.ToArray();
        }
            
        public static T ParseAttributeValue<T>(XmlAttribute attribute, Converter<string, T> converter)
        {
            return attribute == null || string.IsNullOrEmpty(attribute.Value) ?
                                                                                  default(T) :
                                                                                                 converter(attribute.Value);
        }

        public static Uri ParseUri(XmlAttribute attribute)
        {
            return ParseAttributeValue<Uri>(
                attribute,
                delegate(string s) { return new Uri(s); });
        }

        public static T? ParseEnum<T>(XmlAttribute attribute)
            where T : struct 
        {
            return ParseAttributeValue<T?>(
                attribute,
                delegate(string s) { return (T)Enum.Parse(typeof(T), s, true); });
        }
    }
}